The basic drawing intro video shows editing the length of one wall by typing in a value, and the adjacent perpendicular wall shifting as a result. When I draw a simple room of four walls, then try to edit the length of one of the walls, it disconnects it from the room and changes the length of only that wall - the other three walls are unchanged.
Note that this is only if I click on one of the dimension lines and type in the new length (or use the length property in the side panel). If I drag the wall to its new position, the attached walls do update as expected.